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The average age of A and B is 20 y...

The average age of `A` and `B` is 20 years. If `A` is replaced by `C` , the average age becomes 19 years and if `B` is replaced by `C` , the average age becomes 21 years. Find the ages of `A ,\ B` and `C` .

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RS AGGARWAL-AVERAGE-All Questions
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